深入浅出MFC：对话框消息路由

[appmodul.cpp]

extern "C" int WINAPI _tWinMain(HINSTANCE hInstance,                                 HINSTANCE hPrevInstance,                                LPTSTR lpCmdLine,                                 int nCmdShow){    return AfxWinMain(hInstance, hPrevInstance, lpCmdLine, nCmdShow);}

[winmain.cpp]

int AFXAPI AfxWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,                      LPTSTR lpCmdLine, int nCmdShow){    int nReturnCode = -1;    CWinThread* pThread = AfxGetThread();    CWinApp* pApp = AfxGetApp();    pApp->InitApplication();    if (!pThread->InitInstance())    {        return nReturnCode;    }    nReturnCode = pApp->Run();    return nReturnCode;}

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CWinApp::InitApplication
CWinThread::InitInstance
CWinThread::Run
均是virtual函数

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[ProjName.cpp]

BOOL CProjNameApp::InitInstance(){    CWinAppEx::InitInstance();    CTestWYDlg dlg;    m_pMainWnd = &dlg;    INT_PTR nResponse = dlg.DoModal();    if (nResponse == IDOK)    {    }    else if (nResponse == IDCANCEL)    {    }    return FALSE;}

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由于该函数返回FALSE,所以在AfxWinMain中函数结束后直接退出,
不会运行pApp->Run()

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[dlgcore.cpp]

INT_PTR CDialog::DoModal(){    AfxHookWindowCreate(this);    CreateDlgIndirect();    RunModalLoop();   //消息循环    DestroyWindow();  //销毁了窗口    return;}

[wincore.cpp]

int CWnd::RunModalLoop(DWORD dwFlags){    for (;;)    {        if (!AfxPumpMessage())        {            AfxPostQuitMessage(0);            return -1;        }    }    return 0;}

[thrdcore.cpp]

BOOL AFXAPI AfxPumpMessage() {    CWinThread *pThread = AfxGetThread();    return pThread->PumpMessage(); }

[thrdcore.cpp]

BOOL CWinThread::PumpMessage(){    return AfxInternalPumpMessage();}

[thrdcore.cpp]

BOOL AFXAPI AfxInternalPumpMessage(){    MSG msg;    ::GetMessage(&msg);    if (!AfxPreTranslateMessage(&msg))    {        ::TranslateMessage(&msg);        ::DispatchMessage(&msg);    }    return TRUE;}

[thrdcore.cpp]

BOOL AfxPreTranslateMessage(MSG* pMsg){    CWinThread *pThread = AfxGetThread();    return pThread->PreTranslateMessage(pMsg);}

[thrdcore.cpp]

BOOL CWinThread::PreTranslateMessage(MSG* pMsg){    return AfxInternalPreTranslateMessage(pMsg);}

[thrdcore.cpp]

BOOL AfxInternalPreTranslateMessage(MSG* pMsg){    CWnd* pMainWnd = AfxGetMainWnd();    if (CWnd::WalkPreTranslateTree(pMainWnd->GetSafeHwnd(), pMsg))        return TRUE;    return FALSE;}

[wincore.cpp]

//// 返回TRUE or FALSE// 由以上流程得:该函数返回TRUE,则pMsg指向的消息将会被忽略而不处理//                    返回FALSE,则会DispatchMessage到对应的窗口过程函数处理//BOOL PASCAL CWnd::WalkPreTranslateTree(HWND hWndStop, MSG* pMsg){    //    // 先调用本窗口对应CWnd类的PreTranslateMessage    // 再往父窗口层层上溯调用对应CWnd类的PreTranslateMessage直到上溯到hWndStop对应的窗口    // 若其中的某个PreTranslateMessage返回TRUE, 则函数退出返回TRUE    // 否则上溯完成返回FALSE    //    for (HWND hWnd = pMsg->hwnd; hWnd != NULL; hWnd = ::GetParent(hWnd))    {        CWnd* pWnd = CWnd::FromHandlePermanent(hWnd);        if (pWnd != NULL)        {            if (pWnd->PreTranslateMessage(pMsg))                                        return TRUE;        }        if (hWnd == hWndStop)            break;    }    return FALSE;}